Everyone knows Halo gamers don't sleep. But now a group of scientists in Sweden have published new research linking violent video games to increased heart rate variability and sleep disruptions.
Be interesting to know the actual games used rather than just "violent" vs. "non-violent." I doubt that the results of this experiment actually relate violence to sleeping issues, but rather they relate the adrenaline, excitement, stress and captivity of FPS and other "hardcore" videogames. When gaming, the gore such as in Fallout3 provides more of a comic relief than preventing me from sleeping. I believe that the distinction that the "testers" were making was casual, vs hardcore, where hardcore means more immersion, focus, and probably more playing time (CS:S, WoW, or any other triple A title), whereas the nonviolent game was probably Peggle, or Mindsweeper.
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